Lines:

<?php

/**
 * Block Styles
 *
 * @link https://developer.wordpress.org/reference/functions/register_block_style/
 *
 * @package WordPress
 * @subpackage Twenty_Twenty_One
 * @since Twenty Twenty-One 1.0
 */

if ( function_exists( 'register_block_style' ) ) {
/* function twenty_twenty_one_register_block_styles() – Register block styles. */
  add_action( 'init', 'twenty_twenty_one_register_block_styles' );
}
 

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